From the Wikipedia page [1]
Silt'e is a Zone in the Ethiopian Southern Nations, Nationalities, and Peoples' Region (SNNPR). This zone is named for the Silt'e people, whose homeland lies in this zone. Like other nationalities in Ethiopia Silt'e people have their own language Siltish |Siltigna. Silt'e is bordered on the south by Alaba special woreda, on the southwest by Hadiya, on the north by Gurage, and on the east by the Oromia Region.
Following a referendum held between 18 and 26 April 2001, the Silt'e unanimously voted to form their own Zone, Silt'e. Later more woredas from Gurage and Hadya zones and Alaba special woreda were added.